There's a community contribution project on Codelplex for Prism (Composite Application Guidance for WPF and Silverlight). New stuff includes a WindowRegionAdapter, bootstrapper extensions, and the use of Castle Windsor instead of Unity.
We're on the lookout for a docking control for WPF. Here's what I've found so far:-
- http://www.codeproject.com/KB/WPF/WPFdockinglib.aspx now moved to http://www.codeplex.com/AvalonDock
Haven't checked them out as yet - but looks like we'll have plenty to choose from.